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Lum
Aug 13, 2003

ImageMagick has a native windows version (MinGW32) so you don't have to fart about with bash or cygwin, though if you're on Win10, it now has a native linux subsystem which works a lot nicer than cygwin.

I'd probably go about this by having imagemagick crop to the square and output the image as uncompressed .bmp to stdout and then pipe that into md5sum which you can then easily compare to your reference image which has been processed in the same way. This method will only work if they are pixel-perfect accurate, same colour depth and same resolution though.

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